Motion Adaptive Deinterlacer Cross-Chrominance Removal
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Solution Overview
Problem
Conventional video processing systems face challenges in handling cross-chrominance artifacts, which reduce the quality of high-definition television signals due to misinterpretation of luma and chroma information by comb filters, especially in areas with high-frequency details and motion.
Innovation Solution
A method and system for cross-chrominance removal using motion detection, which involves comb filtering, determining luma and chroma current motion, and applying a motion adaptive deinterlacer to filter out cross-chrominance by comparing chroma edge magnitude to a threshold and adjusting the chroma current motion, while limiting the output pixel's temporal chroma average.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If comb filtering is used to separate luma and chroma components, then the video signal can be processed, but cross-chrominance artifacts occur due to misinterpretation of luma information as chroma information
Solution Approach 1:
The patent applies motion detection and motion compensation techniques to dynamically adjust the comb filter operation. By detecting motion in the video signal and compensating for it during chroma/luma separation, the system adapts the filtering process to moving content, reducing cross-chrominance artifacts that occur in static filtering approaches when handling motion.
Solution Approach 2:
The patent changes the operational parameters of the comb filter based on motion detection results. When motion is detected, the system modifies filter coefficients, timing, or phase parameters to account for the motion, thereby maintaining accurate luma/chroma separation without generating cross-chrominance artifacts in moving regions.
2Productivity
If comb filter is used in areas with high-frequency details, then video processing can proceed, but cross-chrominance artifacts increase due to lack of spatial correlations
Solution Approach 1:
The patent applies different processing strategies to different regions of the video signal based on local characteristics. By analyzing spatial correlations and high-frequency content in specific areas, the system applies motion compensation and adjusted comb filtering only where needed, rather than uniformly across the entire signal, thereby reducing artifacts in high-frequency regions while maintaining processing efficiency.
3Measurement precision
If conventional comb filter separates baseband luma signal from modulated chroma, then video decoding can be achieved, but misinterpretation occurs when luma frequency components are close to color sub-carrier
Solution Approach 1:
The patent dynamically adjusts the comb filter's frequency response and timing based on detected motion and spectral analysis. When luma frequency components are close to the color sub-carrier frequency, the system modifies the filter parameters in real-time to maintain proper separation, preventing cross-chrominance artifacts that would occur with fixed filter parameters.
Data Source
AI summary
In a video system, a method and system for cross-chrominance removal using motion detection are provided. A luma motion detector in a motion adaptive deinterlacer may be used to determine a chroma current motion for a pixel in a video frame. The chroma current motion may be modified, based on a chroma motion mechanism comprising of an edge detection, a back-off, and a motion biasing, when the output pixel is found to be in a static chroma area of the video frame. A static chroma threshold parameter may be used to determine whether the output pixel is in a static chroma area. A cross-chroma reduction determined based on the current chroma motion, may be blended in the motion adaptive deinterlacer with a spatial average approximation of the output pixel to remove the cross-chrominance from the output chroma.